Need help with ID of seal/marks

[topcatbooks]

I was going through items I have received over the years and wondering what the marks were.  I have 3 items which include a semi flat plate, a small Porcelain bowl and a larger heavier bowl.  The larger bowl my mother said she purchased from an antique shop.  The small bowl was a gift from a former boss.  I have included photos of the marks.  Any help would be great!  I can post photos of the actual bowls if needed.  Or retake the photos of the marks if they aren't clear.  Thanks again!

[peterp]

First and second "Qianlong Nianzhi", third is "Jingdezhen zhi". All four character marks used in the second half of the 20th century.

[peterp]

Addition:  "nianzhi" means "made in the years of", "zhi" itself means made.
You will find "Qianlong" and "Jingdezhen" by searching the main site.